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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
What is the use of feedback in amplifiers?
A differential amplifier amplifies the difference signal between its two inputs, while rejecting the common mode signal that might be present relative to circuit ground. Operational amplifiers are great for this purpose. With a sufficiently high open loop gain, the Comon Mode Rejection Ratio (CMRR) is excellent. This is done to reject the common mode voltage that is developed in the signal cable, a twisted-pair cable, often caused by noise or AC current in the vicinity of the cable run. Applications include differential microphones, reducing hum, or small signal sensor monitors, often over a large distance such as in a process control application. The differential amplifier is also much easier to setup for a specific gain, as well as to setup for a particular frequency response, because its input impedance is so high, and because its bridge mode operation is very easy to use.
What is the duration of a pure sinusoidal signal?
A true pure sinusoid signal lasts forever, from -infinity to +infinity. If it ever turned on or off it would not be a pure single frequency sinusoid signal. Real signals aren't pure.
Is nicrome wire the best material for conducting electricity?
Nicrome comes in different resistances per unit length and is used in applications where you desire to create a heated wire, like a hot pad or perhaps to melt snow. So best designation depends on your application.
Why an op-amp diode rectifier called as a precision rectifier?
In a rectifier made of just diodes, the diodes have a voltage drop, resulting in a lower DC output voltage. By introducing an Op-amp, this voltage drop can be overcome. Since there is no voltage drop caused by the diodes, the rectified signal is not changed by the rectifier, so it is called a precision rectifier.
What are the applications for single mode fibers?
Hi,
Single mode fiber is used to send the data from transmitter to receiver or repeater. In single mode we can only send single signal at a time and hence it is single mode.
The Single mode fiber will have core and cladding arranged in such a way that the core has got one refractive index and the cladding has got another refractive index which will be constant through out the fiber.
What are counters and registors in electronics?
In digital logic and computing, a counter is a device which stores (and sometimes displays) the number of times a particular event or process has occurred, often in relationship to a clock signal.
A register is a device that can hold a binary number or series of bits-just store it-.
What is ORG in assembly language programming?
ORG is an assembler directive that sets the address of the next generated instruction or data byte.
The question makes no sense. It asks why a pure inductive load is used ... instead of a pure inductive load. Please restate the question.
the switchover
What is the value of capacitor voltage and current after 5 time constant?
After 5 time constants, capacitor voltage/current will be about 99.3% of the input step change.
What do you call a metal clip that connects wires in a circuit?
There are various names and types -
Bug
Crimp Connectors
Butt connectors
Wirenuts
Etc.
The connectors would typically be insulated unless they were use for grounds.
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I believe the NEC specifies 125% of the continous load plus 100% of the intermittent load. Depending on the specifics of your situation this may not be correct ( a different part of the NEC should be referenced).
What is narrow bandwidth antenna?
An antenna (or aerial) is an electrical device which converts electric currents into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver. In transmission, a radio transmitter applies an oscillating radio frequency electric current to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves). In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied to a receiver to be amplified. An antenna can be used for both transmitting and receiving.
Antennas are essential components of all equipment that uses radio. They are used in systems such as radio broadcasting, broadcast television, two-way radio, communications receivers, radar, cell phones, and satellite communications, as well as other devices such as garage door openers, wireless microphones, bluetooth enabled devices, wireless computer networks, baby monitors, and RFID tags on merchandise.
Typically an antenna consists of an arrangement of metallic conductors ("elements"), electrically connected (often through a transmission line) to the receiver or transmitter. An oscillating current of electrons forced through the antenna by a transmitter will create an oscillating magnetic field around the antenna elements, while the charge of the electrons also creates an oscillating electric field along the elements. These time-varying fields radiate away from the antenna into space as a moving electromagnetic field wave. Conversely, during reception, the oscillating electric and magnetic fields of an incoming radio wave exert force on the electrons in the antenna elements, causing them to move back and forth, creating oscillating currents in the antenna.
Antennas may also contain reflective or directive elements or surfaces not connected to the transmitter or receiver, such as parasitic elements, parabolic reflectors or horns, which serve to direct the radio waves into a beam or other desired radiation pattern. Antennas can be designed to transmit or receive radio waves in all directions equally (omnidirectional antennas), or transmit them in a beam in a particular direction, and receive from that one direction only (directional or high gain antennas).
The first antennas were built in 1888 by German physicist Heinrich Hertz in his pioneering experiments to prove the existence of electromagnetic waves predicted by the theory of James Clerk Maxwell. Hertz placed dipole antennas at the focal point of parabolic reflectors for both transmitting and receiving.
No such resistor exists. Any resistor placed in parallel with a 6.0 ohm resistor is going to reduce the combined resistance below 6.0 ohms.
How does the low-voltage circuit controls the power to the high-voltage circuit?
Through a relay or some other kind of high voltage switching device.
Why do ripples reduce in full wave rectifier as compared to half wave rectifier?
Ripple factor (γ) may be defined as the ratio of the root mean square (rms) value of the ripple voltage to the absolute value of the dc component of the output voltage, usually expressed as a percentage. However, ripple voltage is also commonly expressed as the peak-to-peak value. This is largely because peak-to-peak is both easier to measure on an oscilloscope and is simpler to calculate theoretically. Filter circuits intended for the reduction of ripple are usually called smoothing circuits.
The simplest scenario in ac to dc conversion is a rectifier without any smoothing circuitry at all. The ripple voltage is very large in this situation; the peak-to-peak ripple voltage is equal to the peak ac voltage. A more common arrangement is to allow the rectifier to work into a large smoothing capacitor which acts as a reservoir. After a peak in output voltage the capacitor (C) supplies the current to the load (R) and continues to do so until the capacitor voltage has fallen to the value of the now rising next half-cycle of rectified voltage. At that point the rectifiers turn on again and deliver current to the reservoir until peak voltage is again reached. If the time constant, CR, is large in comparison to the period of the ac waveform, then a reasonably accurate approximation can be made by assuming that the capacitor voltage falls linearly. A further useful assumption can be made if the ripple is small compared to the dc voltage. In this case the phase angle through which the rectifiers conduct will be small and it can be assumed that the capacitor is discharging all the way from one peak to the next with little loss of accuracy.[1]
Is David Sarnoff Research Center still in Princeton NJ?
No. The David Sarnoff Library, formerly located in Princeton NJ, has closed, and its exhibits have been relocated to the Hagley Library in Wilmington DE.
Which of the transistor configuration is prefer?
It depends on what you want to do with the transistor. Class A, common emitter, is used for voltage amplification. Class C, common collector, is used for current amplification. There are other classes and configurations but, again, it depends on what you want to do.
Which biasing technique is best for amplifier?
The voltage or Potential divider bias or the self bias circuit is the best biasing technique because,it has very low stability factor(change in collector current with respect to Ico or Vbe or current gain beta).
only in this technique the increase in temperature wont affect the collector current.
Why is CAD useful when producing electronic circuits?
becoz it is help full to draw a neat n clean diagram with all ratings n names of equipment as well as can see every line SO closely by zooming it and it can easily editable this one it the main advantage of it it can be use to present the new drawing and projects........
How many octaves higher is a 7600 Hz sine wave than a 2100 Hz sine wave?
7,600/2,100 = 3.619
(2)x = 3.619
x log(2) = log(3.619)
x = log(3.619)/log(2) = 1.8556 octaves (rounded)
Check:
2,100 x (2)1.8556 = 7,599.947 yay! close enough
